I've been using Flow's bi-directional switching between VisualEditor and wikitext to get some tables posted today. It's pretty handy: Open VisualEditor and drag in a .csv file from my desktop. (That's one way to import a table in VisualEditor.) Use VisualEditor to delete irrelevant columns and rows. Flip back to the wikitext editor to set the class. Switch back to VisualEditor to set some cells to header formatting and merge a couple of cells together. Switch back to wikitext editor to get something that I can paste into the middle of a translated page. I like it.
However, at one point the switch ended with a blank page (something timed out? I couldn't replicate it) and the wikitext box is too small for editing a table that contains more than 100 cells (one line per cell).